At a glance
Based on the row for concentrated, 20 °C.
- Rated A, very good resistance
- PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), NBR, SS 316, SS 304, LDPE, FEP, ECTFE/ETFE, Nylon (PA), Acetal (POM), PVC Flexible, PETG, PMP (18)
- Rated B, good resistance
- Polystyrene, Polysulfone (2)
- Rated C, limited resistance
- Aluminium (1)
- Rated D, not resistant
- Polycarbonate (1)
- No data in the source
- Silicone, SAN
- Rated lower at 50 °C than at 20 °C
- PVDF (A → C), Aluminium (C → D)
- Rating changes with concentration (20 °C)
- Polystyrene: A (aqueous), B (concentrated)
Based on the row for concentrated, 20 °C.
Rating profile by material family
Effect of temperature, 20 °C to 50 °C
Substance
- CAS number
- 1305-62-0
- Formula
- CaH2O2
- Hazard symbols in the source
- Xi (irritant) (pre-GHS European symbols; check the current safety data sheet)
- Concentrations listed
- aqueous; concentrated
- Also listed as
- Slaked Lime (Calcium Hydroxide); Limewater
- Name in the source (German)
- Calciumhydroxid
Rating by concentration
Show as a table
| Material | aqueous | concentrated |
|---|---|---|
| Thermoplastics | ||
| HDPE | A | A |
| LDPE | A | A |
| PP | A | A |
| PVC Rigid | – | A |
| PVC Flexible | – | A |
| PMP | A | A |
| Polystyrene | A | B |
| SAN | – | – |
| Polycarbonate | D | D |
| PETG | A | A |
| Acetal (POM) | A | A |
| Nylon (PA) | A | A |
| Polysulfone | – | B |
| Fluoropolymers | ||
| PTFE | A | A |
| FEP | A | A |
| PVDF | A | A |
| ECTFE/ETFE | A | A |
| Elastomers | ||
| EPDM | A | A |
| Viton (FPM) | A | A |
| NBR | A | A |
| Silicone | – | – |
| Metals | ||
| SS 316 | A | A |
| SS 304 | A | A |
| Aluminium | C | C |
Resistance table: Calcium Hydroxide, aqueous
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| PMP | A | A | |
| Polystyrene | A | A | |
| Polycarbonate | D | D | |
| PETG | A | – | |
| Acetal (POM) | A | A | |
| Nylon (PA) | A | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | A | |
| ECTFE/ETFE | A | A | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | A | A | |
| NBR | A | – | |
| Metals | |||
| SS 316 | A | A | |
| SS 304 | A | A | |
| Aluminium | C | D | |
Not rated in the source, so not in the table: PVC Rigid, PVC Flexible, SAN, Polysulfone, Silicone
Resistance table: Calcium Hydroxide, concentrated
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| PVC Rigid | A | A | |
| PVC Flexible | A | – | |
| PMP | A | A | |
| Polystyrene | B | B | |
| Polycarbonate | D | D | |
| PETG | A | – | |
| Acetal (POM) | A | A | |
| Nylon (PA) | A | – | |
| Polysulfone | B | B | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | C | |
| ECTFE/ETFE | A | A | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | A | A | |
| NBR | A | – | |
| Metals | |||
| SS 316 | A | A | |
| SS 304 | A | A | |
| Aluminium | C | D | |
Rating scale
- A very good resistance
- B good resistance
- C limited resistance
- D not resistant
- – no data
- K no general statement possible
A rating marked * is an estimate in the source, not a test result. An estimate is given as one value without a temperature.
Frequently Asked Questions
Which materials resist Calcium Hydroxide at high concentrations?
The materials with an A rating (resistant) for Calcium Hydroxide at 20 °C are: PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), NBR. These can generally be used in direct contact.
Which materials should be avoided with Calcium Hydroxide?
Materials rated D (not resistant) for Calcium Hydroxide are: Polycarbonate. These should not be used in contact with Calcium Hydroxide.
Does temperature affect chemical resistance to Calcium Hydroxide?
Yes. 2 of 17 tested materials show a worse rating at 50 °C than at 20 °C for Calcium Hydroxide. Materials affected include: PVDF, Aluminium.
Is PTFE safe for Calcium Hydroxide?
PTFE is rated A for Calcium Hydroxide at 20 °C. A rating of A means resistant, B means limited resistance, C means partly resistant, and D means not resistant.
Does concentration affect chemical resistance to Calcium Hydroxide?
Yes. Calcium Hydroxide is tested at 2 concentrations (aqueous, concentrated). Some materials change their rating depending on the concentration.
About this data
The ratings come from the chemical resistance list published by Bürkle GmbH, which compiled them from raw-material manufacturers’ data. They describe laboratory tests on the raw material at 20 °C and 50 °C.
A finished part also sees pressure, mechanical stress, welds and mixtures that a laboratory test does not. Treat the rating as a first filter and test under your own conditions before relying on it.
Chemicals with a similar resistance profile
Same 20 °C rating on the share of materials shown.